2145125251205 has 4 divisors (see below), whose sum is σ = 2574150301452. Its totient is φ = 1716100200960.

The previous prime is 2145125251201. The next prime is 2145125251211. The reversal of 2145125251205 is 5021525215412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414661299364 + 1730463951841 = 643942^2 + 1315471^2 .

It is not a de Polignac number, because 2145125251205 - 2² = 2145125251201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145125251201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214512525116 + ... + 214512525125.

It is an arithmetic number, because the mean of its divisors is an integer number (643537575363).

Almost surely, 2^{2145125251205} is an apocalyptic number.

It is an amenable number.

2145125251205 is a deficient number, since it is larger than the sum of its proper divisors (429025050247).

2145125251205 is an equidigital number, since it uses as much as digits as its factorization.

2145125251205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429025050246.

The product of its (nonzero) digits is 40000, while the sum is 35.

The spelling of 2145125251205 in words is "two trillion, one hundred forty-five billion, one hundred twenty-five million, two hundred fifty-one thousand, two hundred five".